I’ve looked into property management when a duplex near me went up for sale. Your assessment is not wrong. There are many laws and regulations (at least in the USA) around buying rental properties that make it incredibly difficult for new people to get into landlording under the guise of making it harder on landlords. In reality its just a bunch of financial hoops and burdens that established landlords can easily step over but prevents others from becoming landlords.
I if wanted to buy that duplex, I’d have to put like 40% down just to break even and absorb the risk.
24 and 7 make a pythagorean triple with 25 as the hypotenuse. If the problem uses one pythagorean triple, it probably uses another, so I assume x is 15, and the radius is 20.